GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1997 🢒 GMC P52 RV/Van Chassis 🢒 Engine 🢒 Engine Cooling 🢒 Thermostat Housing Crossover

Removal Procedure

    Object Number: 26593 Size: SH
  1. Disconnect the negative battery cable. Refer to

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

    in General Information.
  2. Remove the thermostat. Refer to Thermostat.
  3. Remove the nut, the ground cable, the two nuts, the bolt, and the generator bracket from the studs and the generator.

    4. Object Number: 26589 Size: SH
  4. Remove the wiring harness from the temperature sensor.

    5. Object Number: 26587 Size: SH
  5. Remove the clamp from the bypass hose.

    6. Object Number: 26586 Size: SH
  6. Remove the two studs, the bolts, the crossover and the two gaskets from the engine block.

    7. Object Number: 26585 Size: SH
  7. Remove the clamps and the bypass hose from the crossover and the coolant pump.
  8. Clean all traces of gasket material from the crossover and the engine block.
  9. Inspect the crossover for cracks or other damage.
  10. Inspect the bypass hose for splits, cracks, rotting and other deterioration.

Installation Procedure

    Object Number: 26585 Size: SH
  1. Install the clamps and the bypass hose on the coolant pump.

    2. Object Number: 26586 Size: SH
  2. Install two new gaskets and the crossover on the engine block and the bypass hose with two studs and the bolts.

    3. Object Number: 26589 Size: SH
  3. Connect the wiring harness to the temperature sensor.

    4. Object Number: 26593 Size: SH
  4. Install the generator bracket on the studs and the generator with the three nuts and the bolt.
  5. Connect the ground cable on the stud with the nut.
  6. Install the thermostat on the crossover. Refer to Thermostat.
  7. Connect the battery negative cable.